Questions tagged [arduino]

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96 views

How can I use an Arduino to simulate button presses on this Remote Control PCB

I read with interest here this post: How can I use an Arduino to simulate button presses on this PCB I am a beginner in this and I am trying to learn how to do this based on a small remote control I ...
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1answer
67 views

Voltage and Current Sensor for Alternating Current

I want to measure the voltage and current of a AC powered device using a micro controller like Arduino. I am unable to find it.(I am new to these). Is there a circuit or sensor which isolates from the ...
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1answer
47 views

Soldering iron thermocouple measurement HELP

I'm working on a relatively simple soldering iron circuit. I'm using a T12 tip, which consists of a resistor and thermocouple in series. I'm driving the gate of the N channel mosfet with 20V via a ...
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6answers
11k views

In this transistor circuit, what is the purpose of the diode across the motor?

I am trying to follow an Audrino tutorial with my kid and I am confused by the role of the diode in this circuit. In particular, I have the following questions: It looks like the circuit will work ...
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0answers
43 views

HC-05 missing characters received via serial - possible issue with voltage divider

I have a HC-05 set up (like here) with the receive pin (of the hc-05) getting a voltage of 3.3V from a resistor network of 1.2k and 2.2k from the Arduinos 5V. (I also have a simple software serial ...
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1answer
51 views

How to control a boost converter by using pwm from Arduino [closed]

I am creating a simple boost converter that step up voltage in the range 5V-30V. The switch is a MOSFET controlled by PWM output of an Arduino (with additional necessary components.) I want to ...
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1answer
32 views

How to use arduino control an ESC and flash?

Basically, I want to use PWM wave or something alike from Arduino to directly control the speed of a brushless motor through an ESC. I saw an example on the Arduino Brushless Motor Control Tutorial | ...
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0answers
30 views

Wireless Audio Transmission with NRF24L01

:) I have been planning to do a project on transmitting audio through arduino using NRF24L01 RF Modules at the same time sending data commands. I am really a beginner in terms of audio circuits so I ...
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0answers
71 views

How can I electronically generate a signal similar to the one produced by striking a piezo?

I feel like this is a bit of an unusual request so I'm having a hard time figuring out how to research it. My question is: is there some way that I can use an Arduino to programmatically generate a ...
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0answers
36 views

Amplifying analog signal from AO of KY-038

I'm using a KY-038 for sensing sound if I connect the DO pin and set the potentiometer to the highest viable sensitivity then if I make a loud sound it detects and sends an output upwards until 1023. ...
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1answer
90 views

Why do I have to put my transistor after of my component, instead of before?

I'm working on a very simple project, where I want to control a 24V LED with my arduino. Since the arduino can't output that voltage, I have a separate power source, and use a transistor. This allows ...
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0answers
38 views

Problem with SPI communication to TDC-GP30 Ultrasonic Flow converter

I'm working in TDC-GP30 an Ultrasonic Flow converter chip. Which can be directly hooked up with ultrasonic transducers to get digital output. But the problem is according to the datasheet the chip can ...
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0answers
91 views

Strange readings from external ADC

I am using external ADC MCP33121-10 via SPI interface. I need to isolate this ADC from main procesor (Arduino Mega), so I used optocouplers. The ADC worked fine without optocouplers but when I ...
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0answers
45 views

Relay module and Arduino Isolation; How to acheive?

I'm going to control a 3phase motor with an Arduino Pro mini and and a 1 Ch. relay module. In numerous articles it's been advised to separate Arduino and relay module's Vcc. For sure, the second ...
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1answer
207 views

Arduino thinks I pressed a switch when I touch anything

So I have found something very strange and confusing, When I touch anything even my desk my arduino thinks I connected to the input of any pin I pick. here is a video of what is happening it even ...
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1answer
28 views

Beginner Analog Multiplexer Wiring Help

beginner here, searching for some guidance as I set up my first multiplexer. My breadboard was wired as follows: The T4 refers to my Teensy4.0 microcontroller, its hooked up to the breadboard ground ...
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2answers
74 views

HTTP Post error using ESP8266 from Arduino

Using Arduino on an STM32F103C Blue Pill to drive an ESP8266 ESP-01 as shown below, and this tutorial: Arduino Forum I am attempting to do an HTTP POST with the following code: ...
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4answers
376 views

How to replace a potentiometer with a digital solution in a buck feedback loop?

I have a simple pre-made buck converter that looks something like this: The output voltage can be easily adjusted, by turning the R2 trimpot, which adjusts the voltage the feedback pin is getting. ...
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0answers
47 views

Unable to intercept the code of my remote control at 433 MHz with RaspberryPi

I'm trying to reproduce the code generated by my universal 4-channel radio control with ...
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0answers
38 views

Can I reduce volume of active buzzer with arduino?

I connected arduino's 5v pin to active buzzer's positive. And it makes a loud noise. I tried connecting arduino's 3.3 v pin and yet the active buzzer is making a loud noise. Is there a way to reduce ...
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0answers
52 views

Problem: Arduino signal is not passing through Optocoupler. (Design of 7-level bridge inverter) — Proteus Simulation

I made a 7-level inverter in Proteus and used Arduino code for control pulses It's not simulating. I tried to debug it using the digital analyzer for H-Bridge (as shown in sub-circuit,) and noted ...
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0answers
40 views

Addressing the RAM on the DS1302 RTC timer chip with an Arduino

I'm trying to access the RAM of my DS1302 RTC chip. According to the data sheet, I need to clear bit 7 of the control register. The control register can be accessed at address 8Eh. To test this out, ...
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1answer
40 views

Is it possible to use Bluetooth serial and BLE client simultaneously in ESP32?

Is it possible to use classic Bluetooth and BLE at same time in esp32 with Arduino ? IDE - Arduino ide
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0answers
12 views

Wemos D1 Mini + WS2812B Idle Power Usage

I recently started tinkering with these DIY IOT stuff. My first project was a small switchable LED strip. My question: What is a "normal" idle power usage of such a setup? I'm measuring ~1.2W with ...
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2answers
74 views

Humidity sensor connection “HIH-4000”

Why do we need a load resistor connected between the output pin and ground? reference to a detailed description of the sensor
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1answer
20 views

VNH5019 motor controller

So I want to use the VNH5019 motor Controller shield for the Arduino Uno for a project. My question regarding this is the voltage of the motors. Since they differ from motor to motor I'm not sure ...
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1answer
51 views

Does a capacitor regulate voltage when power is off?

I'm playing with a strip of APA102 LEDs. When VCC is disconnected, but GND, Data, and Clock are left connected, some of the LEDs faintly blink red, which I'm guessing is due to residual power from ...
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3answers
116 views

How to access GPIO pins on Atmega with memory mapping?

I'm programming the Atmega328P in embedded C. I'm going to use 16 pins for turning on LEDs, and I have to use PORTB, PORTD and PORTC for this. I would like to just iterate a pointer so I can turn them ...
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0answers
26 views

Issue regarding TX line of Arduino while communicating with Vending machine via MDB Protocol over USART

I am trying to communicate with a Vending machine using MDB Protocol with the help of Arduino Mega and I am partially successful in doing so. The circuit that I am using is attached here While the ...
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1answer
38 views

Generating bit stream in hardware. Glitches with Arduino

Background I have a bit sequence that I want to transmit through a digital output. My first attempt was to use direct port assignment on an Arduino. I set the duration of each level with noops. For ...
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1answer
29 views

Multiple step-down of DC voltage in one circuit

I need to read some signals from a machine which outputs the bits in form of 0 and 24 VDC. I will be using Raspberry Pi 4 (4 GB) or an Arduino Mega to read the same, however since Raspberry Pi/Mega ...
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1answer
28 views

Voltage Regulation for a high frequency signal - Arduino Input

I'm trying to build a digital tachometer for my motorcycle using an Arduino nano. I have researched a lot on how to reduce the 12 volts from tach signal to 5 volts to be read by the arduino. One post ...
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2answers
142 views

Wich battery configuration I should use to supply raspberry, arduino and stepper motors

I'm working on a project about a self-stirring robot with sensors to avoid walls. This project is composed by one Raspberry responsible for all the algorithms, one Arduino to deal with the sensor ...
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1answer
107 views

AVR ATtiny1634 - Programming Issue

I've have already used Arduino as ISP Programmer to load codes to Atmel chips like ATmega328p and ATmega8 quite a few times without any problem. On my last project though, I decided to use an Atmel ...
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2answers
76 views

Convert 5V PWM Arduino Signal into 12V signal that can deliver 100mA

I am an electronics newbie and I want to convert the 5V PWM signal from an Arduino into a 12V PWM signal which delivers 100mA (rms). How would such a circuit look like? I tried with OpAmps and got the ...
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0answers
63 views

I need some opinions on my power supply design

I designed this power supply to function as an Arduino PS shield. I used four LT3080, one for each of four outputs and the basic cascade design was recommended by the manufacturer. There are four ...
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5answers
156 views

How do I read the state of AC switch, through a microcrontroller?

I wanted to read the state of an AC switch using a microcontroller. S1 is an SPST switch and cannot be changed. What circuit will be required for doing this? I'm using this for my home automation ...
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0answers
42 views

Pin TX0 -> 1 and RX0 <- 0 on ATMega2560 for USB serial communication

I am currently working on a project where I have to make my pc communicate with my ATMega2560 through the USB serial port. The ATMega2560 is the receiver. I have been told that the pins ...
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2answers
89 views

What is RS-485 and MODBUS? [closed]

I understand the title seems too broad but it's a bit specific and I'm totally new to the communication stuff, so please bare with me. If the question is too broad, please provide some suitable links ...
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1answer
55 views

How can I turn a midi keyboard to a stand-alone piano using Arduino or any other way? [closed]

I have a midi keyboard, but I find it frustrating to start PC, DAW system every time I want to play. Is there a way to use Arduino to create an on the go stand alone piano. (It should work like a ...
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3answers
92 views

Convert 1kHz PWM signal to 0-10V DC with minimal ripple [closed]

For my application, I want to control the position of a valve which takes 0-10V input voltage. For the determination of the position I need to use a digitial 5V 1kHz PWM signal from an Arduino Nano. ...
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3answers
169 views

Nixie Tube driver ICs keep dying

I really need a hand here. I am trying to control an IN-19B nixie tube with an Arduino UNO. I am using a 170v power supply with a 20K resistor on the anode and the k155id1 driver IC. I have got things ...
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2answers
87 views

Can't work out Arduino 12v Relay (5v Logic)

I have a 12v relay but I just can't figure out how to use it. I went to tech support, but they just waved me away. So, my problem is that I have an 8 channel relay, but can't get it to work. I did try ...
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1answer
36 views

Esp 8266 - 01 module unable to flash or communicate

I have an ESP8266 module which is not communicating with the Arduino IDE serial monitor unless I press the rest button on the ESP setup. I tried erasing and reflashing the ESP8266 several times, but ...
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3answers
2k views

Do I need to use capacitors when using an L7805CV voltage regulator?

I am building a small water pump (5 V) controlled by an Arduino, and I want to reduce voltage from 9 V to 5 V. Do I need to use capacitors when using an L7805CV voltage regulator?
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1answer
43 views

Controlling speed and position of DC Motor

Is it possible perhaps with an Arduino to control the speed and number of revolutions on a brushless DC motor or a worm gear DC motor? I'm asking because I know steppers and servos can do that but ...
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0answers
29 views

Simulating an RF remote control using an Arduino

I have a remote control for a video light, it's called 'Godox RC-A5'. The most detailed documentation I could find for it is here https://fccid.io/2ABYNRC-A5/Test-Report/Test-Report-2708894.pdf. The ...
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2answers
56 views

Do need to solder on the pin headers panels on the edges of a protoboard or can I just attach them without solder?

I have my first circuit on an Arduino Protoboard, and I was wondering if I had to solder the header pins to the board like the other components?
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1answer
79 views

How to sense a control voltage without pulling it down?

I am working on a project in a photonics teachings lab. In the lab, we perform a demonstration for the students using a \$\mathrm{CO}_2\$ gas laser. The output of the laser is terminated in a ...
2
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3answers
439 views

Is there a way to extend the length of wires for I2C connection? [duplicate]

I would like to connect a BME280 sensor to an Arduino board through the i2c bus connection. I read that i2c was not meant to be used over long wires and will not work properly over 50cm. I want to get ...